The 19 Republicans who flipped positions to support Obamacare repeal

Meet the 19 Republicans who flipped their votes in favor of the ACHA, the bill that effectively repeals Obamacare and allows insurance companies to hike premiums and refuse to sell insurance to people on the basis of "pre-existing conditions" such as being the victim of domestic violence. There's something odd about them. Can't quite put my finger on it.